A tool for managing git repositories

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Jiri

“Jiri integrates repositories intelligently”

Jiri is a tool for multi-repo development. It supports:

  • syncing multiple local repos with upstream,
  • capturing the current state of all local repos in a “snapshot”,
  • restoring local project state from a snapshot, and
  • facilitating sending change lists to Gerrit.

Jiri has an extensible plugin model, making it easy to create new sub-commands.

Jiri is open-source.

Manually build jiri

We have prebuilts for linux and darwin x86_64 systems. In order to build jiri manually use these instructions.

Jiri Behaviour

See this

Jiri Tricks

See this

Jiri Basics

Jiri organizes a set of repositories on your local filesystem according to a manifest. These repositories are referred to as “projects”, and are all contained within a single directory called the “jiri root”.

The manifest file specifies the relative location of each project within the jiri root, and also includes other metadata about the project such as its remote url, the remote branch it should track, and more.

The jiri update command syncs the master branch of all local projects to the revision and remote branch specified in the manifest for each project. Jiri will create the project locally if it does not exist, and if run with the -gc flag, jiri will “garbage collect” any projects that are not listed in the manifest by deleting them locally.

The .jiri_manifest file in the jiri root describes which project jiri should sync. Typically the .jiri_manifest file will import other manifests, but it can also contain a list of projects.

For example, here is a simple .jiri_manifest with just two projects, “foo” and “bar”, which are hosted on github and bitbucket respectively.

<?xml version="1.0" encoding="UTF-8"?>
<manifest>
  <projects>
    <project name="foo-project"
             remote="https://github.com/my-org/foo"
             path="foo"/>
    <project name="bar"
             remote="https://bitbucket.com/other-org/bar"
             path="bar"/>
  </projects>
</manifest>

When you run jiri update for the first time, the “foo” and “bar” repos will be cloned into foo and bar respectively and repos would be put on DETACHED HEAD. Running jiri update again will update all the remote refs and rebase your current branch to its upstream branch.

Note that the project paths do not need to be immediate children of the jiri root. We could have decided to set the path attribute for the “bar” project to “third_party/bar”, or even nest “bar” inside the “foo” project by setting the path to “foo/bar” (assuming no files in the foo repo conflict with bar).

Because manifest files also need to be kept in sync between various team members, it often makes sense to keep your team's manifests in a version controlled repository.

Jiri makes it easy to “import” a remote manifest from your local .jiri_manifest file with the jiri import command. For example, running the following command will create a .jiri_manifest file (or append to an existing one) with an import tag that imports the minimal manifest from the https://fuchsia.googlesource.com/manifest repo.

jiri import minimal https://fuchsia.googlesource.com/manifest

The next time you run jiri update, jiri will sync all projects listed in the minimal manifest.

Quickstart

This section explains how to get started with jiri.

First we “bootstrap” jiri so that it can sync and build itself.

Then we create and import a new manifest, which specifies how jiri should manage your projects.

Bootstrapping

You can get jiri up-and-running in no time with the help of the bootstrap script.

First, pick a jiri root directory. All projects will be synced to subdirectories of the root.

export MY_ROOT=$HOME/myroot

Execute the jiri_bootstrap script, which will fetch and build the jiri tool, and initialize the root directory.

curl -s https://raw.githubusercontent.com/fuchsia-mirror/jiri/master/scripts/bootstrap_jiri | bash -s "$MY_ROOT"

The jiri command line tool will be installed in $MY_ROOT/.jiri_root/bin/jiri, so add that to your PATH.

export PATH="$MY_ROOT"/.jiri_root/bin:$PATH

Next, use the jiri import command to import the “minimal” manifest from the Fuchsia repo. This manifest includes only the projects needed to build the Jiri itself.

You can see the minimal manifest here. For more information on manifests, read the manifest docs.

cd "$MY_ROOT"
jiri import minimal https://fuchsia.googlesource.com/manifest

You should now have a file in the root directory called .jiri_manifest, which will contain a single import.

Finally, run jiri update, which will sync all local projects to the revisions listed in the manifest (which in this case will be HEAD).

jiri update

You should now see the jiri project in $MY_ROOT/src/fuchsia.googlesource.com/jiri.

Running jiri update again will sync the local repos to the remotes, and update the jiri tool.

Managing your projects with jiri

Now that jiri is able to sync and build itself, we must tell it how to manage your projects.

In order for jiri to manage a set of projects, those projects must be listed in a manifest, and that manifest must be hosted in a git repo.

If you already have a manifest hosted in a git repo, you can import that manifest the same way we imported the “minimal” manifest.

For example, if your manifest is called “my_manifest” and is in a repo hosted at “https://github.com/my_org/manifests”, then you can import that manifest as follows.

jiri import my_manifest https://github.com/my_org/manifests

The rest of this section walks through how to create a manifest from scratch, host it from a local git repo, and get jiri to manage it.

Suppose that the project you want jiri to manage is the “Hello-World” repo located at https://github.com/Test-Octowin/Hello-World.

First we‘ll create a new git repo to host the manifest we’ll be writing.

mkdir -p /tmp/my_manifest_repo
cd /tmp/my_manifest_repo
git init

Next we'll create a manifest and commit it to the manifest repo.

The manifest file will include the Hello-World repo as well as the manifest repo itself.

cat <<EOF > my_manifest
<?xml version="1.0" encoding="UTF-8"?>
<manifest>
  <projects>
    <project name="Hello-World"
             remote="https://github.com/Test-Octowin/Hello-World"
             path="helloworld"/>
    <project name="manifest"
             remote="/tmp/my_manifest_repo"
             path="manifest"/>
  </projects>
</manifest>
EOF

git add my_manifest
git commit -m "Add my_manifest."

This manifest contains a single project with the name “Hello-World” and the remote of the repo. The path attribute tells jiri to sync this repo inside the helloworld directory.

Normally we would want to push this repo to some remote to make it accessible to other users who want to sync the same projects. For now, however, we'll just refer to the repo by its path in the local filesystem.

Now we just need to import that new manifest and jiri update. Since we don't want the new manifest repo to conflict with the minimal manifest repo, we must pass the -path flag to the import statement.

cd "$MY_ROOT"
jiri import -path="my_manifest_repo" my_manifest /tmp/my_manifest_repo
jiri update

You should now see the Hello-World repo in $MY_ROOT/helloworld, and your manifest repo in $MY_ROOT/my_manifest_repo.

Command-line help

The jiri help command will print help documentation about the jiri tool and its subcommands.

For general documentation, including a list of subcommands, run jiri help. To find documentation about a specific topic or subcommand, run jiri help <command>.

Main commands are:

   branch      Show or delete branches
   grep        Search across projects
   import      Adds imports to .jiri_manifest file
   init        Create a new jiri root
   patch       Patch in the existing change
   project     Manage the jiri projects
   selfupdate  Update jiri tool
   snapshot    Create a new project snapshot
   status      Prints status of all the projects
   update      Update all jiri projects
   upload      Upload a changelist for review
   version     Print the jiri version
   runp        Run a command in parallel across jiri projects
   help        Display help for commands or topics

Run jiri help [command] for command usage.

Filesystem

See the jiri filesystem docs.

Manifests

See the jiri manifest docs.

Snapshots

TODO(anmittal): Write me.

Gerrit CL workflow

Gerrit is a collaborative code-review tool used by many open source projects.

One of the peculiarities of Gerrit is that it expects a changelist to be represented by a single commit. This constrains the way developers may use git to work on their changes. In particular, they must use the --amend flag with all but the first git commit operation and they need to use git rebase to sync their pending code change with the remote master. See Android‘s repo command reference or Go’s contributing instructions for examples of how intricate the workflow for resolving conflicts between the pending code change and the remote master is.

The rest of this section describes common development operations using jiri upload.

Using feature branches

All development should take place on a non-master “feature” branch. Once the code is reviewed and approved, it is merged into the remote master via the Gerrit code review system. The change can then be merged into the local branches with jiri update -rebase-all.

Creating a new CL

  1. Sync the master branch with the remote.
jiri update
  1. Create a new feature branch for the CL.
git checkout -b <branch-name> --track origin/master
  1. Make modifications to the project source code.
  2. Stage any changed files for commit.
git add <file1> <file2> ... <fileN>
  1. Commit the changes.
git commit

Syncing a CL with the remote

  1. Sync the master branch with the remote.
jiri update
  1. Switch to the feature branch that corresponds to the CL under development.
git checkout <branch-name>
  1. Sync the feature branch with the master branch.
git rebase origin/master
  1. If there are no conflicts between the master and the feature branch, the CL has been successfully synced with the remote.
  2. If there are conflicts:
  3. Manually resolve the conflicts.
  4. Stage any changed files for a commit. git add <file1> <file2> ... <fileN>
  5. Commit the changes. git commit --amend

Requesting a code review

  1. Switch to the feature branch that corresponds to the CL under development.
git checkout <branch-name>
  1. Upload the CL to Gerrit.
jiri upload

If the CL upload is successful, this will print the URL of the CL hosted on Gerrit. You can add reviewers and comments through the Gerrit web UI at that URL.

Note that there are many useful flags for jiri upload. You can learn about them by running jiri help upload.

Reviewing a CL

  1. Follow the link received in the code review email request.
  2. Use the Gerrit web UI to comment on the CL and click the “Reply” button to submit comments, selecting the appropriate code-review score.

Addressing review comments

  1. Switch to the feature branch that corresponds to the CL under development.
git checkout <branch-name>
  1. Modify and commit the code.
git commit --amend
  1. Reply to each Gerrit comment and click the “Reply” button to send them.
  2. Send the updated CL to Gerrit.
jiri upload

Submitting a CL

  1. Note that if the CL conflicts with any changes that have been submitted since the last update of the CL, these conflicts need to be resolved before the CL can be submitted. To do so, rebase your changes then upload the updated CL to Gerrit.
jiri cl upload
  1. Once a CL meets the conditions for being submitted, it can be merged into the remote master branch by clicking the “Submit” button on the Gerrit web UI.
  2. Delete the local feature branch after the CL has been submitted to Gerrit.
  3. Sync the master branch to the laster version of the remote. jiri update
  4. Safely delete the feature branch that corresponds to the CL. git checkout JIRI_HEAD && git branch -d <branch-name>

Dependent CLs

If you have changes A and B, and B depends on A, you can still submit distinct CLs for A and B that can be reviewed and submitted independently (although A must be submitted before B).

First, create your feature branch for A, make your change, and upload the CL for review according to the instructions above.

Then, while still on the feature branch for A, create your feature branch for B.

git checkout -b feature-B --track origin/master

Then make your change and upload the CL for review according to the instructions above.

You can respond to review comments by submitting new patch sets as normal.

After the CL for A has been submitted, make sure to clean up A's feature branch and upload a new patch set for feature B.

jiri update # fetch update that includes feature A
git checkout feature-B
git rebase -i origin/master # if u see commit from A, delete it and then rebase
properly
jiri upload # send new patch set for feature B

The CL for feature B can now be submitted.

This process can be extended for more than 2 CLs. You must keep two things in mind:

  • always create the dependent feature branch from the parent feature branch, and
  • after a parent feature has been submitted, rebase feature-B onto origin/master

FAQ

Why the name “jiri”?

Jiří is a very popular boys name in the Czech Republic.

How do you pronounce “jiri”?

We pronounce “jiri” like “yiree”.

The actual Czech name Jiří is pronounced something like “yirzhee”.

How can I test changes to a manifest without pushing it upstream?

see Jiri local update